Google search interest and TikTok phrase interest are different behaviors. They become comparable when both sit on this product's 0-100 scale. get_growth accepts source google search, tiktok and one keyword. The inner payload lists each source. body is a JSON string and must be parsed a second time. Docs: the API reference. Google notes: the Google Trends guide. TikTok notes: the TikTok guide. Caps: pricing.
Same keyword, two source strings
POST https://api.trendsapi.ai/api
Authorization: Bearer <api_key>
Content-Type: application/json
{"mode":"get_growth","source":"google search, tiktok","keyword":"air fryer","percent_growth":["7D","14D","1M"]}
A live pull on 2026-08-27 kept the Google keyword as air fryer and stored TikTok as airfryer. Read search_term per source. Do not assume the string is unchanged.
Short windows when TikTok history is short
The same session's 3M and 12M TikTok rows returned date_out_of_range with 30 daily points from 2026-07-27 to 2026-08-25. Google's google search series for that term had 261 points and accepted 3M. Align the preset to the shorter source. 7D, 14D, and 1M all succeeded on both in that pull.
What a 0-100 pair means
| Window | tiktok score (recent vs baseline) | google search score | tiktok growth | google growth |
|---|---|---|---|---|
| 7D | 37.8 vs 26.4 | 56.0 vs 58.0 | +43.18% | -3.45% |
| 14D | 37.8 vs 21.5 | 56.0 vs 54.0 | +75.81% | +3.70% |
| 1M | 37.8 vs 31.2 | 56.0 vs 53.0 | +21.15% | +5.66% |
37.8 next to 56.0 is a scale comparison, not "TikTok has fewer people than Google." Google volume on this source was estimated and derived from the trend value. TikTok volume came back as an independent-looking count (3,096,263 recent on 7D). Do not add those volumes.
Live board feeds are a third question
type Google Trends and type TikTok Trending Hashtags have no keyword. They do not replace this pair. Run them when the question is "what is on the board now," not "how did this phrase move on both platforms."