AI Avatar Video Generator Comparison — HeyGen vs Synthesia vs D-ID

An AI avatar video generator turns a written script into a video of a human-looking presenter reading it to camera. Instead of filming yourself, you type or paste a script, pick a stock avatar (or a custom one of your own face), choose a voice and language, and the tool renders a talking-presenter video. This page lines up the 8 tools a Sri Lankan freelancer, marketer, trainer or faceless creator actually chooses between — HeyGen, Synthesia, D-ID, Colossyan, Vidnoz, Elai.io, Creatify and Argil — across the facts that decide which one fits.

1. Cost per finished minute

Plans in this category are priced wildly differently — some by month, some by credits, some by video length — so a raw monthly price tells you little. The fair yardstick is cost per finished minute, computed on each vendor's cheapest paid plan:

cost_per_minute = entry_plan_monthly_price ÷ included_minutes

Where a vendor uses a credit model, credits are converted to minutes using the vendor's own stated rate (for example D-ID bills roughly one credit per second, so 300 credits = 5 minutes) before the same formula is applied. A second arithmetic route, costPerMinuteAnnualUsd(), recomputes the same figure from the annual-billing price so the table can show how much cheaper each minute is when billed yearly.

2. Your monthly cost

For the minutes you actually need each month (M), the tool estimates a real monthly cost using the vendor's own published rules, in this order:

1. If Mis within the plan's included minutes, the cost is simply the plan price.
2. If the vendor publishes a per-extra-minute overage rate (Elai charges USD 2 per extra minute), the cost is the plan price plus overage.
3. Otherwise, the tool steps up to the cheapest published tier whose allowance covers M.
4. If no published plan is large enough and there is no overage rate, the tool shows Enterprise / contact sales rather than inventing a number.

3. The pick-for-me matcher

Each hard filter only ever narrows the set: a tool must satisfy every active filter to survive. Budget keeps tools whose cheapest qualifying plan is within your monthly budget; Free-tier keeps only tools with a genuine free tier; Custom-avatar keeps tools that can clone your face; and the language toggles require a Tamil or Sinhala voice. Survivors are ranked by cost per finished minute ascending, ties broken by the larger included allowance, then a fixed editor tiebreak — so identical inputs always produce identical order.

4. Sinhala and Tamil reality check

For local users this is often the deciding factor. As of 2026-07-12, none of these tools publish a Sinhala presenter voice, so a Sinhala requirement honestly returns zero matches. Tamil is supported by the larger multilingual platforms (Synthesia, HeyGen, Vidnoz, D-ID, Colossyan, Elai) whose 75+ to 175+ language libraries include it. The table's Tamil column and the Sinhala note make this explicit instead of hiding it.

5. The LKR column is indicative

Every USD figure multiplies by an editable rate that defaults to the CBSL indicative Rs 305per USD to produce the rupee columns. It is a constant, not a live feed — your bank's actual rate plus FX margin and card fees will differ by a few percent. Change the rate field to match your bank, or use the Freelancer USD-LKR calculator for a live rate.

• HeyGen — pricing (plans, credits/minutes, custom avatar, resolution)
• Synthesia — pricing (minutes, avatar library, 140+ languages)
• D-ID — pricing (credit model, per-video length, API tiers)
• Colossyan — pricing (plan minutes, languages, SCORM)
• Vidnoz — pricing (free-tier limits, plan minutes)
• Elai.io — pricing (plan minutes, $2/min overage)
• Creatify — pricing (ad-focused plans, credits)
• Argil — pricing (clone/avatar plans, minutes)
• Central Bank of Sri Lanka — Exchange Rates (indicative LKR column)

Every price and minute allowance was last cross-checked against the official pricing pages on 2026-07-12. LKR figures are indicative, using an editable rate that defaults to the CBSL indicative Rs 305per USD. This category changes fast — always confirm current pricing on the vendor's own page before you subscribe.