# sumi vs Synapse

The clearest difference is update cadence: Synapse at every 4 weeks against sumi's every 3 months. sumi's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. sumi sells 1 one-off in-app purchase and Synapse sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

sumi ships an update every 3 months, Synapse every 4 weeks. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | sumi | Synapse |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/sumi-quiet-flashcards/id6759393853/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 3 MB | 8 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [EDEN LOXLEY TIGER ROYE](https://appshunter.io/developer/1878403819) | [Roi Rozenthal](https://appshunter.io/developer/6775226779) |

## What reviewers say

### sumi

[App page](https://appshunter.io/ios/app/sumi-quiet-flashcards/id6759393853)

This app offers a calm and focused approach to revision using spaced repetition. It allows users to import or create study decks and provides intelligent scheduling for optimal memory retention without distracting gamified elements.

**Highlights:** Spaced repetition with FSRS algorithm, Import Anki (.apkg), CSV, TXT, JSON decks, Offline study support, Detailed progress insights, Calm, distraction-free interface, No account or server required

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| sumi pro - lifetime | $9.99 | one-time |


### Synapse

[App page](https://appshunter.io/ios/app/synapse-flashcard-maker/id6780468536)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Synapse Premium | $4.99 | per month |
| Synapse Premium | $49.99 | per year |
| Synapse Premium — Lifetime | $89.99 | one-time |


## Frequently asked questions

### Is sumi free?

sumi is free to download, with in-app purchases available.

### Is Synapse free?

Synapse is free to download, with in-app purchases available.

### Do sumi or Synapse have ads?

Neither sumi nor Synapse shows ads.

### Which is updated more often, sumi or Synapse?

sumi ships an update every 3 months, and Synapse every 4 weeks. Most recently, sumi was updated on November 5, 2026 and Synapse on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*