The honest answer: AceSense and OnForm are different tools for different jobs. AceSense is tennis-specific AI — it auto-detects shots, tracks the ball, classifies strokes, and produces a per-shot coaching report. OnForm is a generic multi-sport video annotation platform — coaches and athletes upload clips and annotate them manually with drawings, voiceovers, and side-by-side comparisons. If you want automation, you want AceSense. If you want a shared workspace with your coach, you want OnForm. Often, players want both. I'm Akshay Sarode, founder of AceSense.

Bottom line up front

OnForm is a generic video annotation platform across many sports. Pricing per OnForm: Coach $19.99–$59.99/mo, Athlete $9.99–$14.99/mo.
AceSense is tennis-specific AI: ball tracking, shot detection, court heatmap, stroke quality, PDF report.
OnForm wins for coach-led manual annotation, side-by-side comparison, voiceover commentary.
AceSense wins for automated tennis analysis where you don't need a human to mark up the video.
Many players use both. AceSense for the automated diagnostic; OnForm for the coach conversation.

TL;DR comparison table

	AceSense	OnForm
Sport focus	Tennis-specific	Multi-sport (generic)
Auto shot detection	Yes	No (manual)
Ball tracking	Yes (TrackNet-style)	No (manual)
Court heatmap	Yes	No
Stroke quality scoring	Yes (pose-feature)	Manual coach feedback
Side-by-side video comparison	Limited	Yes (core feature)
Voiceover annotation	No	Yes
Coach + athlete shared workspace	No (PDF sharing)	Yes (core feature)
Pricing	Free tier + Pro	$9.99–$59.99/mo (source)
Platforms	iOS + Android	iOS + Android

What OnForm does well

OnForm is a serious product with real coaching workflows. Its strengths:

Multi-sport. Tennis, golf, baseball, swimming — coaches with multiple sports use one tool across all of them.
Side-by-side comparison. Put two clips next to each other, sync them, compare technique frame-by-frame. This is excellent for "you vs the pro" coaching.
Voiceover annotation. Coach records a voiceover walking through what they see. Athlete plays it back later.
Drawing tools. Lines, arrows, angles directly on the video. The coach's whiteboard, on video.
Shared workspace. Coach uploads, athlete reviews, comments back, coach replies. Async coaching done well.
Cross-platform. iOS and Android.

What AceSense does well in this comparison

AceSense doesn't do what OnForm does. AceSense does the part OnForm doesn't:

Automated shot detection. Every shot tagged: forehand, backhand, serve, volley. No human annotation required.
Ball tracking. Trajectory, bounce location, speed estimation.
Court keypoint detection. Court coordinates, heatmap, zone analysis.
Stroke quality scoring. Pose-feature breakdown at contact — shoulder rotation, knee bend, contact point.
PDF coaching report. Generated automatically after every session.

OnForm is the canvas. AceSense is the auto-fill.

The real workflow: AceSense + OnForm together

This is the part most comparison posts miss. For players already working with a coach, the two tools are complementary, not competitive.

Sunday match recorded on the phone.

Upload to AceSense. Get the automated report: 184 shots tagged, court heatmap, stroke-quality flags.
Identify the 3–5 shots where the model flagged a technique issue (low shoulder rotation on second serve, late contact on backhand cross-court).
Upload those specific clips to OnForm.
Coach reviews in OnForm, draws on the video, voiceovers commentary.
Tuesday lesson uses the OnForm annotations as the agenda.

OnForm alone forces the coach to find the bad clips themselves — which takes time and costs you money. AceSense alone gives you the diagnostic but no coach conversation. Together, they're cheaper than either premium tier alone (depending on the math) and they cover the whole loop.

When OnForm is the right choice

The non-negotiable section.

Your coach already uses OnForm with their other students. Joining their workspace is the path of least resistance.
You play multiple sports and want one annotation tool across all of them.
You want manual side-by-side comparison of your shot vs a pro's reference clip.
You want voiceover commentary as the primary feedback format.
You want a shared workspace where your coach and you exchange comments on clips over weeks.
Automated tennis analysis isn't a priority — you'd rather have your coach do the work.

When AceSense is the right choice

You don't have a coach but want analysis anyway.
You want automation. Hundreds of shots tagged in minutes, not over a coaching call.
You want tennis-specific analysis — court heatmap, ball tracking, stroke quality — not a blank video canvas.
You're price-sensitive — AceSense's free tier exposes the full pipeline.
You want a PDF report to email to your coach (who can use whatever tool they want to review it).

Pricing breakdown

Per OnForm:

Plan	Price
Athlete	$9.99–$14.99/mo
Coach	$19.99–$59.99/mo

AceSense:

Plan	Price
Free	€0 (full pipeline at capped session length)
Pro	EU-friendly Pro pricing

The two products price for different buyers — OnForm Coach plans target the coach who runs a roster; AceSense Pro targets the individual player. There isn't a single "AceSense vs OnForm at the same price" cell on the matrix because the products do different things.

A note on the "tennis-specific AI" wedge

OnForm is a great video tool. It is not a tennis AI. The closest comparison to AceSense in the OnForm category is zero — you'd have to add manual annotation work to get to anything that resembles AceSense's automated output.

This is why "OnForm for tennis" search queries often resolve to disappointment. The product is excellent, but it doesn't auto-detect tennis shots because it isn't trying to. A coach who uses OnForm for tennis is doing the analysis themselves; the tool is the canvas.

Real example: the player + coach working together

Imagine an NTRP 3.5 player working with a part-time coach. The coach charges €40/30-minute lesson. The player wants to get the most out of each lesson.

Without either tool: the coach spends the first 10 minutes of every lesson asking "how was your week?" and trying to figure out what to work on. €13 of every €40 lesson is overhead.

With OnForm only: the player uploads weekend clips, the coach reviews and annotates between lessons (paid hourly or included in package). Better, but the coach still has to find the clips that matter.

With AceSense only: the player gets an automated weekend report. The lesson agenda is set before the lesson starts. The coach focuses on coaching, not diagnosing.

With both: the player runs AceSense after the weekend match. The 3–5 flagged clips go to OnForm. The coach annotates in OnForm. The lesson agenda is automated and the coach commentary is captured for review later.

The third workflow gets the most out of every €40 lesson. That's the case for using them together.

How to decide in 60 seconds

You want automated tennis analysis: AceSense.
You want coach-led video annotation: OnForm.
You have a coach and you want both: start with AceSense free, layer OnForm in if your coach uses it.
You play multiple sports: OnForm.
Tennis is your only sport and you want depth: AceSense.

FAQ

Is OnForm a tennis app? No. OnForm is multi-sport. It works with tennis video but doesn't auto-detect shots, track the ball, or score stroke quality.

How much does OnForm cost? Per OnForm: Coach plans $19.99–$59.99/mo, Athlete plans $9.99–$14.99/mo.

Can OnForm replace AceSense? No — different categories. OnForm is manual annotation. AceSense is automated tennis analysis.

Should I use AceSense or OnForm with my coach? Often both. AceSense for the automated report; OnForm for the coach conversation about specific clips.