mergedelta measures whether two AI systems actually agree on the same input — frame by frame. When they diverge, the delta tells you which one is performing.
Pick a prompt. We run it through two AI substrates, measure the D-score, and surface the verdict. Five curated cases to start — pattern-matched to what most users ask first.
3 free runs per day. Full access (unlimited cross-substrate queries, your own prompts, API integration) ships 2027 Q2. Join the waitlist and we'll notify you.
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audio substrates · live playback
The same instrument on audio.
mergedelta extends to any two substrates. Here they're audio outputs. Hit async to play both streams at once and let your ears do the delta in real time — or sequential for careful comparison. The same D-score, measured on the audio instead of the text. Three applications, one measurement.
3 free acoustic comparisons per day. Full access — unlimited queries, your own prompts, bring-your-own-TTS pipeline — ships 2027 Q2.
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compose · tag · measure
Tone Shaper
deliberate per-phrase FX shaping for AI voice
Type a line. Drag tags onto phrases — the tag attaches invisibly to the words, no bracket syntax. Preview any highlighted phrase to hear the shaped output. Render through two substrates and see the D-score.
tagged preview · click a tag to arm (◆) then click a word · or drag tag → word
tag palette · drag onto selected word
Free: 6 compressive tags. Pro Max unlocks 20 more (expansive, emotional, scene-directives).
3 free renders remaining today
Substrate A · Gemini TTS
— awaiting render —
Substrate B · @Grok TTS beta
— awaiting render —
what you get
What D-score tells you
One read: did the substrates genuinely converge, or is one performing? A single score, traced to its source — never a rubber stamp.