Filterjam vs Nofret
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
Nofret
Master the guitar fretboard with rapid note recognition. This app drills you on identifying and locating notes quickly, adapting to your skill level. Practice with various modes to improve recall and speed, ensuring you can navigate the neck effortlessly.
- Rapid note identification
- Fretboard location drills
- Speed and accuracy measurement
- Adaptive difficulty
- Two-way training (name/find)
- Landscape mode
- Audible note feedback
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You don't know the fretboard until you don't have to think about it. Most guitarists can eventually work out any note on the neck. Given a few seconds. That's not the same as knowing it — three seconds is far too slow to use mid-song, which is why the fretboard stays a chore long after you've "learned" it. Just starting out? Do this first. Most players put it off for years and pay for it every time they read a chart or work out a scale. Getting it right now saves you that detour. Nofret drills you until you can name or find any note in a fraction of a second. Five minutes a day, aimed at whichever positions are still slowing you down. WHAT MAKES IT DIFFERENT It measures speed, not just accuracy. Your chart is your median response time falling week by week, toward the point where recall stops feeling like recall. It measures your thinking, not your reflexes. A quick speed check runs first — notes handed to you, nothing to identify — and that figure comes off every answer afterwards. It trains both directions. Naming a note you're shown and finding one you're told are different skills, and one doesn't give you the other. Nofret scores them separately; a stage opens only when both are up to speed. It starts where you already are. A short placement test finds the edge of what you know — no grinding through strings you mastered years ago, and no problem if that edge is the very beginning. Stage one is the six open strings, nothing else. It adapts as you go, aiming to keep you around 85% correct. Much easier and you stop learning; much harder and you stop enjoying it. It works in landscape. Turn the phone for twice as much neck, laid out the way it looks when you're playing. You can answer out loud. On the drills that ask you to name a note, say it instead of reaching for the pad, so your eyes never leave the fretboard. Recognition runs on your device. You hear every note. Each position plays as it comes up, so your ear learns alongside your eye. BUILT ON HOW MEMORY ACTUALLY WORKS Every question is a retrieval attempt, not a review — pulling something out of memory strengthens it far more than seeing it again. Positions come back just as they start to fade, a new string is drilled alone before it's mixed with everything else, and moving up a stage takes two days, because a night's sleep is part of how the first one holds. WAYS TO PRACTICE Two modes are scored, and moving up a stage needs both: Note ID — you're shown a position, you name the note Note Hunt — you're given a note, you find it on the neck Four more are untracked, for breaking through whatever's holding the scored modes back: Free Practice — loose reps, narrowed to any strings, frets or notes you like New String — only the string your stage just introduced Weak Spots — only the positions you're slowest on Find Them All — one note, every place it lives on the neck Plus Study — browse the whole neck, nothing timed or scored. NINE STAGES From the six open strings to the whole neck — all 24 frets, sharps and flats. SEE WHERE YOU HESITATE A heatmap of the whole neck, colored by speed or accuracy. You'll find gaps you didn't know you had — and watch them close. PLAY IT YOUR WAY Alternate tunings — Drop D and Open G — each with its own stage, history and streak. Sharps or flats, whichever you read faster. NO ACCOUNT. NO ADS. NO TRACKING. Everything stays on your device. Nofret works entirely offline. FREE TO START The first two stages — the open strings and the low E — are free forever, with both scored modes, Free Practice, Study and your history. A complete app, not a demo. Nofret Pro unlocks the other seven stages, three more practice modes — New String, Weak Spots and Find Them All — and the alternate tunings. Nofret Pro is a one-time purchase, at a founding price for the first buyers. No subscription, no renewal, nothing to cancel. Try it as long as you like first: the free stages never expire.
Screenshots
Verdict
The clearest difference is in-app purchases: Filterjam at none against Nofret's 1. Filterjam also leads on ratings volume (34 vs 2) and device support (3 vs 1). On price, rating, ads 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. Nofret sells 1 one-off in-app purchase. Filterjam asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Filterjam against 5.0 for Nofret. That said, the two scores are not equally well evidenced: Filterjam has 34 ratings behind it against 2, so its average is the more settled of the two.
| Parameter | Filterjam | Nofret |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (34 ratings) | 5.0 (2 ratings) |
| Positive reviews | 83.3% of reviews | — |
| Number of ratings | 34 — better | 2 |
| Update frequency | Every 22 months | — |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 14.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 25 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | AudioThing Ltd. | Pierce Boyne |
Customer experience
Filterjam
Nofret
In-app purchases
Filterjam
No in-app purchases
Nofret
- Nofret Pro — Lifetime$12.99








