Roboto AUv3 Singing Synth vs apeCsound
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Roboto AUv3 Singing Synth
Create synthesized singing voices by drawing melodies and typing lyrics. Offers ten distinct voice presets, extensive vocal parameter control, and automation curves. Export your creations as WAV audio or MIDI files.
- Piano roll melody editor
- Lyric input per note
- Ten voice presets
- Vocal parameter automation
- WAV audio export
- MIDI file export
- AUv3 and standalone support
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Write a melody, type a word on each note, and Roboto sings it. A synthesized singing voice with ten presets, automation curves, WAV and MIDI export. AUv3 and standalone. Roboto is a singing voice synthesizer. Write a melody in the piano roll, type a word on each note, and Roboto sings it. No samples are used: the voice comes from a glottal pulse source, five formant resonators and shaped noise for the consonants. An animated robot face follows the voice with its LED eyes and mouth, next to a live waveform and the lyrics lit in time. PIANO ROLL AND LYRICS • Draw the melody in the piano roll and type a word on each note • A note named + sings the next syllable of the previous word • English words are turned into phonemes by built-in rules and a word list • Phonemes can be typed directly, for example S-T-R-IY-T • Select notes with a box, then move, duplicate, cut, copy and paste them • A note named - keeps singing the vowel before it at a new pitch • 23 built-in songs to try, in every language TEXT TAB • The whole song as text, one entry per note in the form word:note:beats • Type a song from scratch or paste one in LANGUAGES • Sings in English, German, French, Spanish, Japanese, Russian, Finnish, Swedish, Italian and Portuguese • Spelling rules for each language and vowels measured from native speakers VOICE • Ten voice presets: Default, Robot, Soprano, Bass, Child, Whisper, Choir, Opera, Giant, Alien • Transpose and tempo, with optional sync to the host • Glide: how fast the pitch slides between legato notes • Vibrato depth and rate, jitter and breath • Consonant level and length • Formant shift (vocal tract size) and formant bandwidth • Reverb and double track • Sliders show their value on the thumb, and above your finger while you drag AUTOMATION • Curves along the song for volume, pitch bend, vibrato depth, breath, formant shift and chorus • Curve points snap to the grid and are sized for touch • All voice parameters can be automated by the host MIDI • Keys from C1 upwards sing from the matching bar for as long as they are held • Keys on MIDI channel 2 change the sung pitch live without changing the words, sliding between keys at the Glide speed • Controllers drive volume, vibrato, breath, formant shift and chorus • Bluetooth MIDI in the standalone app EXPORT • WAV audio • MIDI file with notes, lyrics, tempo and the curves as controllers AUv3 + STANDALONE Run Roboto as a standalone app on iPhone and iPad, or as an AUv3 instrument inside any AUv3 host.
apeCsound
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apeCsound brings the full power of Csound 7, one of the most complete sound synthesis and signal processing languages ever created, inside your music apps. Write or paste any Csound orchestra, press Apply, and apeCsound turns it into an Audio Unit (AUv3) instrument or effect you can play, record and automate in GarageBand, Logic Pro for iPad, AUM, Cubasis, Loopy Pro and any other AUv3 host. It also runs as a standalone app. THE CSOUND ENGINE, BUILT IN Csound 7 is embedded in the app: nothing else to install Thousands of opcodes: oscillators, filters, physical models, granular, spectral (pvs), FM, waveguides, reverbs, delays, OSC and much more Process live audio from the host as an effect, or play it as a MIDI instrument Audio channels follow the host layout automatically Host transport available to your code as control channels: tempo, play/stop, position, time signature PARAMETERS YOUR HOST CAN AUTOMATE Describe sliders, switches, menus and XY pads directly in your .csd file apeCsound builds the control panel for you and exposes every parameter (176 in all) to the host for automation and MIDI learn Values are read in Csound with a simple chnget; chnset writes them back and moves the controls Organise the panel in collapsible groups with a comment in the code Snapshots: save, recall, rename and overwrite complete sets of values, stored with the session Undo and redo for every change, with one shared history LIVE CODING Evaluate sends the selection, the current instrument block or a single line to the running engine, without recompiling: redefine an instrument while it plays, change a global value, trigger a score event A dedicated Evaluate line for one-liners such as "i 2 0 1" SEE WHAT YOUR CODE IS DOING Monitor: every value written with chnset appears as a meter, a multi-bar card or a text line, with dB scale and history on request Channels: a diagnostic list of every channel the engine knows, with type, direction, value and who writes it; channels that nobody writes are flagged and can be mapped to a parameter in one tap Graphs: function tables and display signals drawn live, redrawn whenever a table changes Console: all Csound messages and errors, with errors marked on the line in the editor A CODE EDITOR MADE FOR CSOUND Syntax highlighting with dark and light themes, line numbers and adjustable text size Opcode completion that inserts the complete syntax, with outputs and optional arguments, in classic or modern (functional) style Jump between arguments with Tab Inline help bar showing the syntax of the opcode under the cursor, or the error on that line Find and replace, comment/uncomment, smart indentation Designed for touch: native-style selection handles, magnifier, edit menu and long-press caret navigation Built-in link to the Csound reference manual SESSIONS AND FILES Open and save standard .csd files from Files, iCloud Drive or any document provider Your code, parameters and snapshots are saved with the host project Start from a ready-made template, a blank session or one of nearly 200 included examples Import Cabbage and CsoundQt files: their widgets become parameters, their meters and displays show up in the Monitor ACCESSIBILITY Fully usable with VoiceOver: named controls, real menus, an accessible code editor and XY pad, complete keyboard navigation Whether you are a sound designer, a composer, a teacher or a student, apeCsound turns your iPad and iPhone into a complete Csound workstation that lives inside your favourite music apps.
Screenshots
Verdict
The clearest difference is update cadence: apeCsound at every 2 days against Roboto AUv3 Singing Synth's every 9 days. Roboto AUv3 Singing Synth's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17). On price, ads and in-app purchases 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.
Roboto AUv3 Singing Synth ships an update every 9 days, apeCsound every 2 days. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.
| Parameter | Roboto AUv3 Singing Synth | apeCsound |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 9 days | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 15.0 — better | 17 |
| Further details — not scored | ||
| Size | 18 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | DiscoDSP LLC | apeSoft |
In-app purchases
Roboto AUv3 Singing Synth
No in-app purchases
apeCsound
No in-app purchases





