Isometric vs Verra: How the Two Carbon Registries Compare for Nature Projects

Verra is the established registry for nature credits: a US nonprofit whose VCS program covers reforestation, forest management, REDD+ and wetlands, where the developer hires the verifier and pays the fees. Isometric is a younger company that started in carbon removal. For nature it has reforestation, agroforestry, mangrove, forest management and savanna fire protocols; it picks and pays the verifier, charges the buyer, and publishes the data behind each certificate. Both issue credits only after verification and have an ICVCM-approved reforestation methodology, though Isometric's approval covers an earlier version. Verra credits can qualify for CORSIA; Isometric's nature credits can't yet.

It compares published rules, not outcomes, and is not legal or investment advice. First-party documents checked November 2, 2026. For the other standards, see carbon standards for nature projects compared.

Isometric vs Verra at a glance

Isometric vs Verra at a glance

For nature projects	⁠Isometric	⁠Verra VCS
Nature methods	Reforestation (ARR) agroforestry mangroves IFM savanna fire	Reforestation (ARR) IFM (US only) REDD+ tidal wetlands
Credits issued before trees grow	No	No
Fees paid by	The buyer	The developer
Buffer	20% flat, or set by a risk model (10% minimum, 8% for IFM; savanna fire is flat only), into a shared pool	Set by a risk tool, 12% minimum, into a shared pool
ICVCM quality label (reforestation)	Version 1.1 approved; current 1.2 not yet	Approved, VM0047 1.0 and 1.1 (current)
CORSIA airline eligibility, 2024–2026	No, nature credits excluded	Yes, with conditions
Verifier	Chosen and paid by Isometric	Hired and paid by the developer
Reforestation baseline	Each project pixel matched to 10 or more satellite control pixels	Satellite stocking index for the project, against matched control plots
Project data made public	Yes, the data behind each certificate, unless marked confidential	Project documents and calculations
Run by	Isometric HQ Limited, a company	Verra, a US nonprofit

Status as of November 2, 2026.

Which nature projects each covers

⁠Isometric. Reforestation (version 1.2) for land that once held forest and wasn't deforested in the past 10 years; Agroforestry (1.1); Mangrove Restoration (1.1); and Improved Forest Management (1.1), credited through modules for smallholders deferring harvest and for logged forest moved into protection. A savanna fire protocol, certified in October 2026, credits both carbon stored and cuts in methane and nitrous oxide. An avoided deforestation protocol was announced in September 2026 and isn't certified yet.

⁠Verra. VM0047 (1.1) for afforestation, reforestation and revegetation, with an area-based approach and a census-based one for up to 50 planting units, such as trees or shrubs, per hectare on land that stays in use; VM0045 (1.2) for forest management in the contiguous United States, against national forest inventory plots, with a version for other countries consulted on in May 2026; VM0048 for REDD+; and VM0033 (2.1) for tidal wetlands and seagrass, with a version 3.0 consulted on in September 2026.

What each asks from the field

Both build the reforestation baseline from satellite data and both treat field plots as the measure of what grew. The difference is how often you go back, and who sees the result.

⁠Isometric. Biomass comes from field plots, from LiDAR, or from global biomass maps, and the last two still need field plots "as the source of truth for benchmarking the maps". With field plots alone, you sample them at the start and end of every reporting period; with LiDAR or maps, at least every five years. Inside each sample plot, every tree over 10 cm in diameter gets a species and a diameter. Validation and the first verification include site visits to the plots. Each project pixel is matched with at least 10 control pixels to set the baseline (Reforestation 1.2, sections 7, 9 and 12). Isometric publishes the data, calculations and evidence behind each certificate, though a developer can ask to restrict some of it to buyers and the verifier (Isometric carbon; Reforestation 1.2, section 7.6).

⁠Verra. An area-based project compares a satellite stocking index for the project with matched control plots, and measures above-ground biomass in sample plots every five years or more often. A census-based project counts every planted tree and measures a sample of them. Credits are cut by the half-width of the 90% confidence interval, as a share of the estimate, minus 10 points, and none are issued once that half-width passes 100% of the estimate. Verra keeps a list of vetted stocking index providers, added five on October 28, 2026, and projects may also use others. Project documents and calculation spreadsheets are public, except commercially sensitive information; Verra's document list doesn't name plot-level field data. From July 1, 2027, VCS version 5 asks for a geolocation file at validation and at each verification (VM0047 1.1, VCS version 5 dates).

See what VM0047 asks you to record and how many inventory plots an ARR project needs.

Buffer and permanence

⁠Isometric. 20% of each reporting period's credits go to a forestry buffer pool, or a project-specific risk model sets the share, with a 10% floor (8% for forest management). After crediting ends, reforestation and mangrove projects keep monitoring for 40 to 100 years; agroforestry commits 40 to 120 years in total. If a reversal was avoidable, later credits go to the pool until it is repaid; after crediting ends, the developer repays it with certificates from its other projects or from another project Isometric accepts. Since October 20, 2026, reforestation projects can use approved insurance in place of part of their buffer contribution, now set out in Standard 2.2; the protocol text hasn't been updated to match yet (Reforestation 1.2, section 10; Standard 2.2, section 5.6).

⁠Verra. Credits go to the pooled AFOLU buffer, sized by Verra's non-permanence risk tool. The lowest rating is 12%. A project fails if its total rating is above 60%, or if internal or natural risk is above 35% or external risk above 20%. Longevity and monitoring run at least 40 years; the crediting period can be shorter. After an avoidable reversal, Verra issues no more credits to that project or the developer's other projects until it is repaid. If no verification report is submitted within five years of the last approved verification request, all the project's buffer credits are put on hold; from July 1, 2027, reforestation and forest management projects that have reached their long-term average are exempt (VCS Standard 5.0, section 3.2; Registration and Issuance Process 5.0, section 5.3.6; risk tool procedure).

How fast credits are issued

Neither issues credits for trees that haven't grown yet. Both credit verified growth only.

⁠Isometric. Reforestation reporting periods normally run one to five years, and the first can be longer to allow for tree growth. Credits are issued when a period is verified, so the first issuance comes at least a year after the start. Validation can happen with the first verification. The project comment period is 10 days, extended to 30 if material comments arrive or a stakeholder asks for more time (Standard 2.2, sections 3.3 and 4.2). Isometric says certificates are "issued in days" once a project is verified (Isometric carbon).

⁠Verra. Validation can start during the 30-day public comment period, and Verra says it "can take up to a year, in some cases longer". A project can also request registration and its first verification review together. Its own reviews take up to 40 business days, plus up to 20 for each round of responses, and a review may take two or three rounds (VCS FAQ). For requests from July 1, 2027, version 5 has projects list within one year of the crediting start, reforestation projects request registration within eight years of it, and every project request a verification at least every five years (VCS Standard 5.0, section 3.8; Registration and Issuance Process 5.0, section 4.1.2).

What each costs

At Isometric the buyer pays one fee per tonne on delivery; at Verra the developer pays each fee below. Neither schedule includes your own project design, planting or field costs.

What each costs

Cost	⁠Isometric	⁠Verra VCS
Before registration	No fee	$1,500 listing, $3,750 registration review
Registry account	No fee	$750 to open plus $750 a year, both due at approval ($1,500 in year one)
Verifier (VVB)	Included in the per-tonne fee	Paid separately by the developer
Per verification	Included in the per-tonne fee	$5,000 review, $2,500 of it credited toward levies
Per tonne	$2.00–5.00, paid by the buyer, lower when the supplier issued more the year before	$0.23 per tonne claimed

Fees as of November 2026.

Isometric's 2026 fee for nature projects, which it calls Biosphere, is $5.00 a tonne when the supplier issued fewer than 100,000 certificates under that protocol the previous calendar year, and falls in steps to $2.00 at 350,000 and above; tiers are reset each January 1 (⁠pricing). Verra charges its $0.23 on the tonnes claimed; if fewer credits are approved, the same total is spread over those issued. Verra also charges $0.02 a credit to transfer or retire, billed to the account that makes the move (⁠fee schedule 1.2). At Isometric the fee is the buyer's, so it shows up in the price you negotiate rather than in your budget. See what a carbon project costs.

How buyers see the credits

Which one fits your project

Isometric

Verra VCS

What both verifiers check

Whichever registry you choose, the credits rest on the same field record: plots you can find again years later, the species and diameter of the trees in them, boundaries that match the geolocation file, and who measured what and when. Isometric publishes the data behind each certificate; Verra's verifier remeasures a sample of it. Either way it has to hold up a decade on, after crews and spreadsheets have changed.

Restoration Scope keeps properties, plots, trees, measurements and photos connected on one map, with offline capture for field crews. It doesn't calculate credits or replace your verifier. See Restoration Scope for carbon projects.

Parcels and plots in one place.

Each property's status, owner and area, beside its boundary on the map. Field teams open a monitoring plot on their phones: the plot circle with each measured tree inside it, above the plot record. Demo project: names and numbers are made up.

More guides: carbon standards for reforestation, IFM carbon standards, blue carbon standards and Plan Vivo vs Gold Standard vs Verra.

Disclosure: Restoration Scope makes field and monitoring software for carbon project developers. We are not a standard, a registry or a verifier, and we don't issue credits.