KeyFinder vs Filterjam
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KeyFinder
Identify the musical key of any song you're listening to. Use the integrated piano to play along and confirm notes, helping the app pinpoint the correct key. Explore music theory and learn to play songs in different keys.
- Identify song keys
- Built-in piano keyboard
- Note confirmation
- Narrow down possible keys
- Learn songs in any key
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Ever wondered what the key of a song being played is? Wonder no more! Just use the built-in piano keyboard to play along with a song's melody. As you confirm notes that coincide with what's being played, KeyFinder will narrow down the number of possible keys the song is in. -=-= About Scoreless Music =-=- What's next after knowing a song's key? Why not learn to play that same song in ANY key? Find out more at scorelessmusic.com
Filterjam
This app offers a multiband resonant filter for creating unique audio effects. It divides input signals into four bands, allowing for various sonic manipulations from subtle enhancements to extreme sound mangling.
- Multiband resonant filtering
- 4-band signal division
- Sum or multiply band modes
- Versatile sound shaping
- Ringmod-like effects
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Filterjam is a multi-band resonant filter delivering weird ringmod-like filtered sounds. The input signal is divided into 4 bands that are then summed or multiplied together according to the selected mode. Filterjam can be very harsh or gentle, it can add brightness or depth to synth sounds, but it can also completely mangle acoustic sources.
Screenshots
Verdict
The clearest difference is rating: Filterjam at 5.0 against KeyFinder's 2.7. Filterjam also leads on review sentiment (83% vs 60%). KeyFinder's advantage is update cadence (every 3 months vs every 22 months) and ratings volume (322 vs 34). On price, ads, in-app purchases and monetization model 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.
Filterjam holds the better App Store score, 5.0 against 2.7. That said, the two scores are not equally well evidenced: KeyFinder has 322 ratings behind it against 34, so its average is the more settled of the two. Written reviews point the same way: 60% of KeyFinder's written reviews are positive against 83% of Filterjam's.
KeyFinder ships an update every 3 months, Filterjam every 22 months. The most recent releases landed on October 8, 2026 and October 1, 2026 respectively.
| Parameter | KeyFinder | Filterjam |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (322 ratings) | 5.0 (34 ratings) — better |
| Positive reviews | 60.0% of reviews | 83.3% of reviews — better |
| Number of ratings | 322 — better | 34 |
| Update frequency | Every 3 months — better | Every 22 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 5 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Scoreless Music | AudioThing Ltd. |
Customer experience
KeyFinder
Filterjam
Bugs and requests
KeyFinder
Reported bugs
4 issues- No sound
- Slow response to touch
- Cannot play minor scales in Ref mode
- Difficulty controlling volume with background music
Requested features
8 requests- Bring the app back
- Update to 64bit
- Label notes on piano keys
- Ability to move up and down the keyboard
- More keys supported (hundreds)
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- Control app volume separately from music
- Show relative minor next to major
- Make a music notation application
Filterjam
Not enough reviews yet to summarise bugs or requests.
In-app purchases
KeyFinder
No in-app purchases
Filterjam
No in-app purchases
