How is SignalBoy different from a “read later” app?

There is no queue, no unread counter and no “mark as reviewed” button, so there is nothing to review. In “read later” apps a saved link waits until you read and archive it. In SignalBoy, saving means something caught your interest, and that is where your part ends. SignalBoy does the rest: it reads the source, says what it contributes and whether it matters to you, and keeps it as knowledge you come back to by asking or searching. The Signals list shows everything you have saved, and you open it when you want to.

Is it only for developers and AI people?

No. SignalBoy helps anyone who saves more than they read: recipes, a trip plan, a whiteboard photo before an exam or a bike review before buying. An AI agent is just one way to save, next to the browser and the phone.

Does SignalBoy summarize articles?

It does more than a summary. A report says what the material specifically contributes, what it means for you (only when that follows from the source and your context), what its key limitation is, and gives citations from the source. It also adds up to three references to earlier saves, if they really fit. A report is created for every item you save, including a photo, a screenshot or a recipe outside your usual interests, and without a filled-in profile.

Does SignalBoy read photos and screenshots?

Yes. You pick a camera photo or a screenshot in Photos and save it without a link, up to five at a time, with a note if you like. You can also paste a screenshot right after taking it: in iOS choose “Copy and Delete”, and the screenshot won’t stay in your camera roll. SignalBoy reads what is in the image: a menu, a lecture whiteboard, a wine label or a slide. The content goes into the report, into search by meaning and into answers in chat, and the item gets a category like any other. Only you see your photos and screenshots.

Can I delete the photos from my phone after saving?

Yes, if you want to. After a confirmed save, SignalBoy can delete the selected originals from Photos, and iOS always asks for your permission. If Photos syncs with iCloud, the original also disappears from your other devices. The item stays in SignalBoy, visible only to you.

Do I need an AI agent?

No. A browser is enough, and soon an iPhone too. If you use the Hermes agent, you can also save material straight from your conversation with it, for example in WhatsApp or in the terminal. SignalBoy builds and maintains the integrations. They are not partnerships with agent makers.

How do I save from my iPhone? And Android?

The iPhone app is coming soon to the App Store. From a page or app you will choose Share → SignalBoy and save the link with a note and screenshots. Photos and screenshots from Photos are saved without a link. The app also has chat and Signals. The Android app is in the works. Until then you can save material from the browser.

Is this a “second brain”?

It is a private knowledge base built from what you save, the reports and your notes, with no manual tidying. You search by meaning or ask SignalBoy, and the answer points to the source and a citation.

Do I have to fill in a profile or categories?

No. The profile is optional and blocks nothing. SignalBoy assigns matching categories itself and only proposes new ones: you accept, edit or dismiss them. An item without a category is just as complete.

What does SignalBoy know about me, and is my material private?

What you state in your profile stays yours. Separately, SignalBoy keeps a readable list of observations drawn from what you save and your conversations. You can check each one (with its evidence), edit it, turn it off and undo it. Saved material, photos and screenshots belong to your account and is visible only to you. Deleting a source also deletes its index and access to its citations. The agent token can only save: it doesn’t read your knowledge and doesn’t manage your account.

How much does it cost and how do I get access?

There is no pricing yet. We give access from the waitlist: sign up and we will get in touch with an invitation.

For people who save more than they read

Your knowledge assistant. Make sense of what you save.

Save links, articles, photos and screenshots the way you already do. SignalBoy reads them, tells you what they mean for you and answers with citations, with no list to clear.

Join the waitlist

A report for every save
A citation with every answer
Browser; iPhone and Android soon

Sound familiar?

You save it for later. Later never comes.

A photo, a screenshot or a saved link takes a second. Reading it, understanding it and finding it again a month later does not.

“I’ll snap it for later”

A menu, the whiteboard after class, a hotel, a terminal error. Thousands of photos and screenshots on your phone, and no time to go back or way to search them.

“Where was that?”

You remember a great recipe or a guide to mortgages. You don’t remember which of five apps it’s in.

“Saved, but about what?”

A title and a link don’t tell you what the piece contributes. To find out, you have to read all of it.

“Staying organised takes work”

Folders, tags and Sunday reviews. After a month everything lands in one pile anyway.

This is not another inbox. SignalBoy doesn’t add a reading list. It reads for you.

See how it works

What is deliberately missing

Unread counter
Mark as reviewed
“Read this” reminders

How it works

You save. SignalBoy reads and turns it into knowledge.

Saving ends your part. SignalBoy reads the whole source, photo or screenshot and adds what it means to your knowledge.

iPhone · Share and PhotosMushroom ramenLecture whiteboard photoScreenshot: hotel in Alfama

Browser · address and noteHalf-marathon training planBathroom renovation estimateFirst pike catch

Hermes · WhatsAppLisbon in 3 daysE-bike market reportThread on API rate limits

Hermes · terminalMCP server authorizationNew SDK documentationLibrary changelog

Reads the whole source

SignalBoy’s interpretationMushroom ramen in 40 minutesWhiteboard: price elasticityMCP server authorizationFirst pike catchrecipes.example · from iPhonephoto · from iPhoneexample.dev · via Hermesfishing.example · from browser

ContributesQuick mushroom brothFormula and three examples from the boardShort-lived token patternChoosing bait by season

For youMeat-free, as in your noteUseful for the examFits your agentNew topic, no judging

LimitationNeeds dried shiitakeSkips luxury goodsApplies to remote serversCovers lakes, not rivers

From source3 citations to check3 citations from the photo2 citations to check2 citations to check

Related1 saved earlier2 saved earlier2 saved earlierNone, and that’s fine

Done in the background.No work from you.

SignalsAdded

Mushroom ramen in 40 minutesWhiteboard: price elasticityMCP server authorizationFirst pike catchCookingStudiesWorkNo category

Half-marathon training planSport

Bathroom renovation estimateHome

Ask or searchwhat to pack for Lisbon?quick broth for ramenWhat will help the project?exam revisionAnswer with citations from sources

iPhone · Share and PhotosMushroom ramenLecture whiteboard photoScreenshot: hotel in Alfama

Browser · address and noteHalf-marathon training planBathroom renovation estimateFirst pike catch

Hermes · WhatsAppLisbon in 3 daysE-bike market reportThread on API rate limits

Hermes · terminalMCP server authorizationNew SDK documentationLibrary changelog

Reads the whole source

3 · Report from the sourceMushroom ramen in 40 minutesWhiteboard: price elasticityMCP server authorizationFirst pike catchSignalBoy’s interpretation

ContributesQuick mushroom brothFormula and three examples from the boardShort-lived token patternChoosing bait by season

For youMeat-free, as in your noteUseful for the examFits your agentNew topic, no judging

LimitationNeeds dried shiitakeSkips luxury goodsApplies to remote serversCovers lakes, not rivers

From source3 citations to check3 citations from the photo2 citations to check2 citations to check

Related1 saved earlier2 saved earlier2 saved earlierNone, and that’s fine

Done in the background.No work from you.

4 · Your knowledgeAdded

Mushroom ramen in 40 minutesWhiteboard: price elasticityMCP server authorizationFirst pike catchCookingStudiesWorkNo category

Bathroom renovation estimateHome

Four steps in the app. Only the first one is required.

01 · You, in one moveShare a link from your iPhone, paste it in the app or send it to your agent. Photos and screenshots go straight from Photos, no link needed.

Add a signal

Address or text

recipes.example/mushroom-ramen

Your note(optional)

For Saturday, four people, no meat

Screenshot(optional)

Add a file

Saving means interest. It doesn’t create a task.

Saved. The source and your note are already in your signals. The rest happens in the background, you can close this window.

SignalProcessed

Mushroom ramen in 40 minutes

recipes.example · saved yesterday

CookingAsian cooking

Saved source

“Soak the dried shiitake for 20 minutes and pour the soaking water into the broth. It gives a deep flavour without hours of simmering.”

Your note

For Saturday, four people, no meat.

SignalBoy’s interpretation

The recipe brings a way to make broth in 40 minutes instead of several hours. It is meat-free, so it fits your note about Saturday’s dinner.

Limitation. Dried shiitake are hard to find in a small shop, and the recipe doesn’t offer a substitute.

Saved earlier, related: “Gyoza step by step”, “Homemade udon noodles”.

Suggested next step

Buy dried shiitake at an Asian grocery or online before Saturday.

Show citations (2)

New category suggestion

Name

Asian cooking

Connects this recipe with ones you saved earlier. Untick any that don’t fit.

Mushroom ramen in 40 minutes
Gyoza step by step
Best kitchen knives 2026

Categories are optional. An item without a category is just as complete.

Signals · Search

quick meat-free dinner for four

Category:AllCookingTravelStudiesSearch by meaning, not by title

Mushroom ramen in 40 minutes
Cooking
recipes.example · yesterday
Saved source
“The mushroom broth is ready in 40 minutes…”
One-pan chickpea curry
Cooking
screenshot · 3 weeks ago
Saved source
“Tinned chickpeas, coconut milk and 20 minutes on the hob…”

Ask SignalBoy about these results

The screens show the product with fictional material. A report is created for every item you save, whether it is a recipe, a work article or a photo of a lecture whiteboard, and without a filled-in profile.

SignalBoy in conversation

You ask in plain words. SignalBoy answers from your sources.

Instead of digging through bookmarks and your camera roll, you just ask. The answer is based on what you have saved and shows where it comes from.

Ask SignalBoy:

Chat · SignalBoy

Compare this bike with the ones I have already saved.

You have two more similar bikes saved. I compare only what is in those materials, with no ratings from other sources.

1Bike from today’s saveMid-drive motor and 22 kg. The test covers city riding only.
2Bike saved in OctoberLighter (19 kg), rear-wheel motor, shorter range.
3Bike saved in SeptemberThe cheapest, but the article rests on a single test.

Cites:City bike test, “Range” sectionE-bike ranking 2026, paragraph 2

Ask about your saved material or type /recall

Chat · SignalBoy

Which of my saved materials will help with the macroeconomics exam?

Three items fit the exam: a photo of the lecture whiteboard, your note and an article that expands an example from class. The rest belong to other subjects.

1Whiteboard: price elasticityPhoto from class: the formula and three examples. Luxury goods are missing.
2Notes: inflation and interest ratesYour note from November, with two examples from Poland.
3Why fuel prices rise faster than they fallThe article expands the class example on price asymmetry.

Cites:Whiteboard: price elasticity, text in the photoWhy fuel prices…, paragraph 5

Ask about your saved material or type /recall

Chat · SignalBoy

Which of the things I saved this week will help in my project?

Of this week’s material, three touch on an agent that calls company tools. The rest are interesting reads that stay in your knowledge but need no action.

1MCP server authorization in practiceA narrow-scope token pattern instead of a single key.
2Rate limits for tool calls in agentsA concrete retry scheme that your note from Tuesday was looking for.
3Overview of agent tracing librariesA comparison of three tools. The takeaway applies to self-hosted setups only.

Cites:MCP server authorization in practice, paragraph 4Rate limits for tool calls in agents, “Retrying” section

Ask about your saved material or type /recall

Chat · SignalBoy

Where does the claim that Lisbon will be less crowded in May come from?

The claim rests on a single passage of the source. That it fits your trip I inferred from your note, and I marked it that way.

1Quote from the source“Before June, the queues for tram 28 and the castle are half as long.”
2Your note“Trip in May, with the kids.”
3SignalBoy’s interpretationMay falls before the high season, so the plan from the article should hold up.

Cites:Lisbon in 3 days: neighbourhoods without the crowds, paragraph 6Your note, whole entry

Ask about your saved material or type /recall

Everything or a single itemAsk about all your knowledge, or talk about one thing you saved.
A citation for every claimA citation opens the passage of the source. SignalBoy’s inference is labelled as an inference.

Want to ask about your own material? Join the waitlist

Trust and privacy

Your material stays private. Every takeaway shows its proof.

SignalBoy can be wrong, like any model. That is why it shows what it relies on, and what it has learned about you comes with its evidence.

Settings · Context

What SignalBoy has learned about you

What you state in your profile stays yours. Observations are a separate list and never overwrite it.

You’re planning a trip to Lisbon in May, with the kids.
Evidence: an article, two screenshots, a photo and your note
You mostly cook without meat.
Evidence: your notes on two recipes
You’re interested in fishing.
Evidence: one saved item

Only for youOnly you see your saves, photos and screenshots. Delete a source and its index and citations go with it.
Quote apart from takeawayEvery part of a report is labelled: the source, your note, SignalBoy’s interpretation or a suggested step.
It advises, it never actsIt won’t buy, publish or install anything for you.
You see what it knows about youEvery observation comes with its evidence, and you can edit it, turn it off or undo it.

Save from anywhere

You don’t change your habits. You save where you already are.

A link, a photo or a screenshot: from your phone, your browser or an AI agent. An agent is not required.

PhoneComing soonFrom Photos you save photos and screenshots without a link, up to five at a time. From a page or app: Share → SignalBoy, with the link. iPhone coming soon to the App Store, Android in the works.
BrowserPaste an address, add a note, and attach a screenshot if you like.
AI agentSend a link to your agent, for example Hermes in WhatsApp or the terminal. The agent only gets a save receipt, and its key can only save.

Comparison

“Read later” gives you a backlog. SignalBoy gives you answers.

Bookmarks, “read later” apps and phone photos are good at keeping things. None of them reads for you.

Bookmarks, “read later” apps, phone photos and SignalBoy.Ai compared on four aspects
Aspect	Bookmarks	“Read later”	Phone photos	SignalBoy.Ai
Your work after saving	Folders to keep tidy	Reviewing and archiving	Scrolling and clearing out	None. Categories if you want them
You get right away	Title and address	Text to read	An image with no context or link	A report: contribution, limitation, citations
How you come back	By title	By title and tag	By scrolling or by a keyword	By asking or by meaning, with a citation
Over time	The list grows	The backlog grows	The photos pile up	New saves connect with earlier ones

Compare SignalBoy with:

BookmarksSignalBoy.Ai

Your work after saving: Folders to keep tidyNone. Categories if you want them
You get right away: Title and addressA report: contribution, limitation, citations
How you come back: By titleBy asking or by meaning, with a citation
Over time: The list growsNew saves connect with earlier ones

“Read later”SignalBoy.Ai

Your work after saving: Reviewing and archivingNone. Categories if you want them
You get right away: Text to readA report: contribution, limitation, citations
How you come back: By title and tagBy asking or by meaning, with a citation
Over time: The backlog growsNew saves connect with earlier ones

Phone photosSignalBoy.Ai

Your work after saving: Scrolling and clearing outNone. Categories if you want them
You get right away: An image with no context or linkA report: contribution, limitation, citations
How you come back: By scrolling or by a keywordBy asking or by meaning, with a citation
Over time: The photos pile upNew saves connect with earlier ones

Save without the guilt. Join the waitlist

FAQ

Questions? Here are the answers.

Don’t see your question?Write to us: signalboy@sbai.pl

Waitlist

Join the waitlist. Make sense of what you save.

We send invitations in order. The iPhone app is coming soon to the App Store, and the Android app is in the works.