Comparison

Jotsuyo vs Synapse Reads

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Jotsuyo

Features
Read full description

This application is a search aid using Safari extension. Pre-registered keywords can be easily added to search keywords. Also, advanced searches such as exact match search can be easily performed.

About

Synapse Reads

Features
Read full description

Stop letting your reading disappear. You finish a book, feel changed by it, and three weeks later can't remember a single idea. Synapse fixes that. READING SESSIONS Open any book and start a session. Synapse tracks your reading time while you capture highlights — scan a page, type a quote, or read it aloud and let AI transcribe it instantly. When you finish, see exactly how long you read, what you captured, and whether Synapse found a new connection during that session. FLASH INSIGHTS When two highlights from different books share an unexpected idea, Synapse surfaces it automatically. Powered by Claude, the connections go beyond the obvious — finding threads across books you read years apart that you never would have noticed yourself. THREE WAYS TO CAPTURE Scan physical pages with your camera. Type or paste quotes directly. Or hold the mic and read a passage aloud — Whisper transcribes it and shows you the text to confirm. However you read, capturing a highlight takes seconds. CHAT WITH YOUR LIBRARY Ask your entire collection a question. "What do my books say about focus?" "Find a quote I saved about habits." Every answer comes from your own highlights — not the internet. IMPORT YOUR KINDLE HIGHLIGHTS Upload My Clippings.txt and your entire Kindle library arrives instantly — with covers, metadata, and connection checks running automatically. WHO IS THIS FOR? Non-fiction readers who want their highlights to actually do something. People who finish books and want to remember them. Anyone building a reading habit who wants to see it grow. Download Synapse and make everything you read count.

Screenshots

Jotsuyo3 screens
Synapse Reads4 screens

Verdict

The call

The clearest difference is update cadence: Jotsuyo at every 3 days against Synapse Reads's every 4 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Jotsuyo ships an update every 3 days, Synapse Reads every 4 weeks. The most recent releases landed on October 14, 2026 and October 11, 2026 respectively.

Scorecard1 real difference · 5 level
Jotsuyo versus Synapse Reads: the parameters behind the verdict, then further details
ParameterJotsuyoSynapse Reads
PriceFreeFree
Update frequencyEvery 3 days — betterEvery 4 weeks
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.415.1 — better
Further details — not scored
Size21 MB32 MB
Age rating4+4+
DeveloperShuhei TakezawaAnsh Dave

In-app purchases

None

Jotsuyo

No in-app purchases

None

Synapse Reads

No in-app purchases

Questions

Is Jotsuyo free?
Jotsuyo is free to download, with no in-app purchases.
Is Synapse Reads free?
Synapse Reads is free to download, with no in-app purchases.
Do Jotsuyo or Synapse Reads have ads?
Neither Jotsuyo nor Synapse Reads shows ads.
Which is updated more often, Jotsuyo or Synapse Reads?
Jotsuyo ships an update every 3 days, and Synapse Reads every 4 weeks. Most recently, Jotsuyo was updated on October 14, 2026 and Synapse Reads on October 11, 2026.

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