Comparison

Tone generator vs OnLock

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Tone generator

Create various periodic signals with adjustable frequency and amplitude for testing electronic circuits or tuning instruments. Features include a metronome, a real-time tuner, and options for generating different noise types and tone sequences. It also offers unique features for hearing tests and party games.

Highlights
  • Generate periodic signals
  • Adjustable frequency and amplitude
  • Integrated instrument tuner
  • Metronome for practice
  • Hearing ability tests
  • Generate white/pink noise
  • Create tone sequences
Features
Read full description

Generate various periodic signals with different waveforms with adjustable frequency and amplitude. These are used to test electronic circuits such as amplifiers and filters. Also suitable for musicians to tune their instruments. As soon as a note sounds, the integrated tuner recognizes the pitch and displays the note name and deviation. For any instrument that produces an even tone. A metronome also helps you to practise. Drive insects away or compare your hearing ability with your friends and relatives and share your results! Or watch others straining their ears to find the sounds that cannot locate you. Party fun is guaranteed! optional features (Purchase): - free of Ads - manual frequency input - support app functionality for connected Bluetooth devices, e.g. speaker - different signals - white/pink noise - tuner for tuning instruments (real-time tone recognition C1-C8) with tuning whistle - metronome for a steady tempo - note/tone for frequency - Left/right channel, stereo - create a tone sequence for playing several different frequencies in particular time slot - loop for tone sequence - save and delete tone sequences - load saved tone sequences - send your tone sequence as an audio file (.caf format) - option to compress audio files Attention: If you want to share your results with others, first test your audible frequencies, then mark under the speakers your lowest audible tone and your highest audible tone (stored only temporarily). A small hint: the chart will show you what other frequencies of your age are still possible to reach.

About

OnLock

Features
Read full description

OnLock es tu bóveda personal para los documentos que de verdad importan. Todos los archivos y documentos importantes en un único sitio: DNI, Pasaporte, Pólizas, Contratos, Certificados... Escanea papeles físicos con la cámara, importa PDFs y fotos, guarda certificados digitales (.p12), pólizas, contratos, garantías, recibos. Todo cifrado en tu dispositivo antes de salir, todo disponible en tus dispositivos a través de tu cuenta iCloud privada. Y cuando importas, Apple Intelligence te sugiere título y categoría leyendo el contenido en tu propio iPhone — sin que nada salga del dispositivo. PRIVACIDAD REAL, NO SLOGAN • Todo se cifra en tu dispositivo antes de almacenarse. • OnLock no recopila datos. Cero analítica, cero trackers, cero terceros. • Sin servidores propios. Tus documentos viajan solo por tu cuenta iCloud privada. • El acceso se protege con Face ID o Touch ID, configurable. ESCANEA Y ORGANIZA • Escáner de documentos con detección automática de bordes y corrección de perspectiva. • Importa desde Archivos o Fotos. • Hace una foto rápida cuando no es un documento, sino un ticket, una etiqueta, una pizarra. • Texto reconocido on-device para que los PDFs sean buscables. • Organiza por categorías personalizables. • Marca tus favoritos. APPLE INTELLIGENCE EN TU IPHONE • Al importar o escanear, OnLock te sugiere título y categoría leyendo el contenido del documento. • El análisis ocurre íntegramente en tu propio iPhone. Nada se sube a ningún servidor. • La sugerencia se adapta a tus categorías: renombra "Hogar" como "Casa" y la IA sigue acertando. • Tú confirmas o ajustas con un tap. Puedes desactivarlo desde Ajustes → Importación. GUARDA CUALQUIER ARCHIVO IMPORTANTE • PDFs, imágenes y archivos arbitrarios como certificados digitales (.p12). • Comparte cuando lo necesites. SINCRONIZACIÓN PRIVADA POR ICLOUD • Tus documentos aparecen en todos tus dispositivos con el mismo Apple ID. • Si cambias o pierdes el móvil, no pierdes nada. PAGO ÚNICO. SIN SUSCRIPCIONES. OnLock es una app nativa para iPhone y iPad, diseñada con sensibilidad por Apple: Liquid Glass, animaciones sutiles, Dynamic Type, VoiceOver y modo claro/oscuro.

Screenshots

Tone generator4 screens
OnLock4 screens

Verdict

The call

The clearest difference is price: Tone generator at Free against OnLock's $2.99. Tone generator also leads on iOS requirement (12.0 vs 26.0). OnLock's advantage is in-app purchases (none vs 3) and ads (none vs shown). On 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

CostPrice · In-app purchases · Ads · Monetization

Tone generator is free to download; OnLock costs $2.99 up front. Tone generator sells 3 one-off in-app purchases. OnLock asks for nothing beyond the download.

UpkeepUpdate frequency

Tone generator ships an update every 5 months, OnLock every 5 weeks. The most recent releases landed on October 11, 2026 and September 23, 2026 respectively.

Scorecard5 real differences · 5 level
Tone generator versus OnLock: the parameters behind the verdict, then further details
ParameterTone generatorOnLock
PriceFree — better$2.99
Rating4.0 (152 ratings) — better—
Positive reviews67.1% of reviews—
Number of ratings152 — better—
Update frequencyEvery 5 monthsEvery 5 weeks — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better26.0
Further details — not scored
Size27 MB10 MB
Age rating4++4
Developermichael heinzRuben Gonzalez

Bugs and requests

Tone generator

Reported bugs

10 issues
  • Doesn't go lower than 10hz
  • Crashes before I can export even though I paid for the feature
  • Fake app. Buying the upgrade doesn't do anything. There is no support. You can't export like it says you can. It's a scam.
  • app is modified
  • No tone
Show 5 more
  • Frozen on my iPad
  • Doesn't produce any sound
  • No sound
  • Faulty
  • No sound

Requested features

7 requests
  • Wish I had a manual that explains a couple functions
  • More precise way to select the frequency
  • Playing of multiple tomes
  • Manually enter a frequency
  • More than one voice
Show 2 more
  • Dark mode option
  • Advanced analytics dashboard

OnLock

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Tone generator

One-time3
  • Extra-Feature 1$1.99
  • No advertising$1.99
  • Upgrade to full version$3.99
None

OnLock

No in-app purchases

Questions

Is Tone generator free?
Tone generator is free to download, with in-app purchases available.
Is OnLock free?
OnLock costs $2.99, with no in-app purchases.
Do Tone generator or OnLock have ads?
Tone generator shows ads; OnLock does not.
Which is updated more often, Tone generator or OnLock?
Tone generator ships an update every 5 months, and OnLock every 5 weeks. Most recently, Tone generator was updated on October 11, 2026 and OnLock on September 23, 2026.

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