303 Note vs KALKUL
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
303 Note
Quickly create, manage, and play back acid bassline synth sequences. Features a step sequencer, built-in synth knobs for tone shaping, and CSV export for backups. Ideal for musicians needing to save and recall patterns.
- Step sequencer interface
- Instant pattern playback
- TB-303 style tone knobs
- CSV pattern export
- Dark mode support
Read full descriptionHide full description
TB-303 note is an app for quickly jotting down and managing acid bass line synth sequences — TB-303, Behringer TD-3, Roland TB-03, and more. Perfect for those moments when: "I want to recreate this pattern on another machine, but checking all the original settings is a hassle..." "My hardware's memory is full, but I don't want to lose my favorite patterns." Patterns you save can be played back instantly. Turn the built-in synth knobs to dial in that signature squelch while you shape your line. Key Features: - A dedicated interface: A step sequencer screen that feels just like the real hardware. Note, Down/Up, Accent, and Slide — all editable on one screen. - Built-in preview playback: Audition your patterns instantly, even while editing, so you can hear it and tweak it on the fly. - TB-303-style tone knobs: CUTOFF / RESO / ENV / DECAY / ACCENT — dial in the feel before you commit it to hardware. - Dark mode support: Easy on the eyes during late-night studio sessions or on a dark club stage. - CSV export: Export your saved patterns as CSV for easy backup and management on your computer. Keep your acid basslines safe and ready, anytime, anywhere.
KALKUL
Read full descriptionHide full description
the feeling of another future [0x036] how does it feel? why are you here, why not on another path of spacetime? you are here because you are curious. you are here because you want to feel more. KALKUL is a sub-movement to explore alternate branches of technology. a KALKUL is something you can collect and experience. download the app and apply for your first KALKUL. a key to a secret space in Tokyo. another future is possible.
Screenshots
Verdict
The clearest difference is update cadence: KALKUL at every 6 days against 303 Note's every 4 weeks. KALKUL also leads on iOS requirement (16.0 vs 18.6). 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.
303 Note ships an update every 4 weeks, KALKUL every 6 days. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.
| Parameter | 303 Note | KALKUL |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (9 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 9 — better | — |
| Update frequency | Every 4 weeks | Every 6 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 18.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 23 MB | 71 MB |
| Age rating | 4+ | 4+ |
| Developer | tsubasa hattori | Kalkul Inc. |
In-app purchases
303 Note
No in-app purchases
KALKUL
No in-app purchases
