Synapse Notes vs ChatNPU
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Synapse Notes
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Synaps Notes is a private, on-device note app built for local AI. Write and organize notes directly on your iPhone. Chat with your own notes and documents using local AI models. Import PDFs, images, and text files with OCR support. Keep your data on-device by default, with optional Google Drive backup. No account is required to use the core features
ChatNPU
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ChatNPU Keyboard rewrites your text instantly in the style you choose. Select an identity, tap once, and you are offered a new version powered by on-device AI. Built for privacy, your typed and rewritten text stays on device. ChatNPU is available on supported devices with the required on-device AI capabilities.
Screenshots
Verdict
The clearest difference is update cadence: Synapse Notes at every 2 days against ChatNPU's every 8 days. 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Synapse Notes ships an update every 2 days, ChatNPU every 8 days. The most recent releases landed on October 13, 2026 and October 3, 2026 respectively.
| Parameter | Synapse Notes | ChatNPU |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 days — better | Every 8 days |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Can Ahmet Ozguven | RBN SPC LTD |
In-app purchases
Synapse Notes
No in-app purchases
ChatNPU
No in-app purchases
