Brandwave

Plan A vs Sweep:Which is more popular?

In September 2026, Plan A had more branded searches than Sweep among carbon accounting platforms worldwide. Plan A had about 76,600 branded searches, while Sweep had 70. Plan A made up 93.2% of all carbon accounting platform searches we track, and Sweep accounted for 0.09%. When we asked ChatGPT and Google AI Overviews about carbon accounting platforms, Sweep appeared in three of the five answers and Plan A in none.

Among carbon accounting platforms worldwide in September 2026

Who do people search for more?

Plan A, about 1094 searches for every 1 for Sweep

Plan A 76.6K searchesSweep 70 searches

Who does AI mention more?

Sweep, mentioned in 3 of 5 answers, Plan A in 0

Sweep in 3 of 5Plan A in 0 of 5

Who does AI recommend more?

Sweep, the only one of the two named

Sweep first in 3Plan A never named

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Top carbon accounting platforms in ChatGPT and Google AI Overviews

In three ChatGPT questions and two Google AI Overviews, Sweep was mentioned in three out of five: in all three ChatGPT answers, but not in either of the two Google AI Overviews. Plan A did not appear in any of the five answers.

Most recommended by AI

Brands get a higher ranking if they are mentioned earlier in the answers.

  1. Watershed1st
  2. Persefoni2nd
  3. Sweep3rd
  4. Greenly4th
  5. Normative5th
  6. Plan A–

Mentioned by AI

Each dot is one answer, filled in when that answer mentions the brand.

  • Persefoni4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Watershed4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Greenly3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Sweep3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Normative1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Plan A0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers

See every answer about carbon accounting platforms

5 answers

Not named in any answer:

Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.

Is Plan A or Sweep more popular in search?

This chart shows how often people search Google for Plan A and Sweep by name. Each line represents a brand's share of searches for all six carbon accounting platforms we track, month by month, from English-language searches worldwide.

Plan A and Sweep among carbon accounting platforms worldwide, by month

Share of searches by month for Plan A, Sweep. The figures are in the table below the chart.

View monthly share of searches table
MonthPlan APersefoniGreenlyWatershedNormativeSweep
Oct 202591.4%7.3%0.53%0.43%0.23%0.08%
Nov 202591.3%7.3%0.62%0.43%0.23%0.09%
Dec 202591.7%7.3%0.38%0.35%0.18%0.09%
Jan 202692.7%6.2%0.4%0.45%0.16%0.1%
Feb 202692.1%6.8%0.38%0.4%0.23%0.09%
Mar 202694%5.1%0.33%0.3%0.14%0.13%
Apr 202692.9%6.1%0.39%0.36%0.12%0.1%
May 202693%6.1%0.34%0.36%0.14%0.1%
Jun 202692.5%6.5%0.34%0.39%0.14%0.08%
Jul 202692.4%6.5%0.37%0.47%0.1%0.11%
Aug 202693%6.1%0.34%0.36%0.11%0.06%
Sep 202693.2%5.4%0.64%0.47%0.26%0.09%

How has the Plan A and Sweep comparison changed over the last 12 months?

3 findings
  • Plan A was ahead of Sweep in every measured month of the 12 months ending September 2026.
  • Across the 12 months ending September 2026, Plan A’s share of searches among carbon accounting platforms worldwide moved from 91.4% to 93.2%, and its estimated monthly branded searches moved from 82.6K to 76.6K.
  • Across the 12 months ending September 2026, Sweep’s share of searches among carbon accounting platforms worldwide moved from 0.08% to 0.09%, and its estimated monthly branded searches held steady at 70.

How did search popularity change for carbon accounting platforms worldwide in September 2026?

0 changes

Neither Plan A nor Sweep moved beyond provider rounding among carbon accounting platforms in September 2026.

How are branded searches counted?

3 search terms

Brandwave collects information about searches that people make online using Plan A’s and Sweep’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.

Plan A

2 branded search terms

  • plan a
  • plana

Sweep

1 branded search term

  • sweep carbon

How the Brand Demand Index is measured

Other head-to-heads among carbon accounting platforms

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