diff --git a/crates/prover/src/constraint_framework/mod.rs b/crates/prover/src/constraint_framework/mod.rs
index 9bbf05402..8baf0d083 100644
--- a/crates/prover/src/constraint_framework/mod.rs
+++ b/crates/prover/src/constraint_framework/mod.rs
@@ -7,6 +7,7 @@ mod info;
 pub mod logup;
 mod point;
 pub mod preprocessed_columns;
+pub mod relation_tracker;
 mod simd_domain;
 
 use std::array;
diff --git a/crates/prover/src/constraint_framework/relation_tracker.rs b/crates/prover/src/constraint_framework/relation_tracker.rs
new file mode 100644
index 000000000..df3996d63
--- /dev/null
+++ b/crates/prover/src/constraint_framework/relation_tracker.rs
@@ -0,0 +1,189 @@
+use std::fmt::Debug;
+
+use itertools::Itertools;
+use num_traits::Zero;
+
+use super::logup::LogupSums;
+use super::{
+    EvalAtRow, FrameworkEval, InfoEvaluator, Relation, RelationEntry, TraceLocationAllocator,
+    INTERACTION_TRACE_IDX,
+};
+use crate::core::backend::simd::m31::{PackedBaseField, LOG_N_LANES, N_LANES};
+use crate::core::backend::simd::qm31::PackedSecureField;
+use crate::core::backend::simd::very_packed_m31::LOG_N_VERY_PACKED_ELEMS;
+use crate::core::backend::simd::SimdBackend;
+use crate::core::backend::Column;
+use crate::core::fields::m31::{BaseField, M31};
+use crate::core::fields::secure_column::SECURE_EXTENSION_DEGREE;
+use crate::core::lookups::utils::Fraction;
+use crate::core::pcs::{TreeSubspan, TreeVec};
+use crate::core::poly::circle::CircleEvaluation;
+use crate::core::poly::BitReversedOrder;
+use crate::core::utils::{
+    bit_reverse_index, coset_index_to_circle_domain_index, offset_bit_reversed_circle_domain_index,
+};
+
+#[derive(Debug)]
+pub struct RelationTrackerEntry {
+    pub relation: String,
+    pub mult: M31,
+    pub values: Vec<M31>,
+}
+
+pub struct RelationTrackerComponent<E: FrameworkEval> {
+    eval: E,
+    trace_locations: TreeVec<TreeSubspan>,
+    n_rows: usize,
+}
+impl<E: FrameworkEval> RelationTrackerComponent<E> {
+    pub fn new(location_allocator: &mut TraceLocationAllocator, eval: E, n_rows: usize) -> Self {
+        let info = eval.evaluate(InfoEvaluator::new(
+            eval.log_size(),
+            vec![],
+            LogupSums::default(),
+        ));
+        let mut mask_offsets = info.mask_offsets;
+        mask_offsets.drain(INTERACTION_TRACE_IDX..);
+        let trace_locations = location_allocator.next_for_structure(&mask_offsets);
+        Self {
+            eval,
+            trace_locations,
+            n_rows,
+        }
+    }
+
+    pub fn entries(
+        self,
+        trace: &TreeVec<Vec<&CircleEvaluation<SimdBackend, BaseField, BitReversedOrder>>>,
+    ) -> Vec<RelationTrackerEntry> {
+        let log_size = self.eval.log_size();
+
+        // Deref the sub-tree. Only copies the references.
+        let sub_tree = trace
+            .sub_tree(&self.trace_locations)
+            .map(|vec| vec.into_iter().copied().collect_vec());
+        let mut entries = vec![];
+
+        for vec_row in 0..(1 << (log_size - LOG_N_LANES)) {
+            let evaluator =
+                RelationTrackerEvaluator::new(&sub_tree, vec_row, log_size, self.n_rows);
+            entries.extend(self.eval.evaluate(evaluator).entries());
+        }
+        entries
+    }
+}
+
+/// Aggregates relation entries.
+// TODO(Ohad): write a summarize function, test.
+pub struct RelationTrackerEvaluator<'a> {
+    entries: Vec<RelationTrackerEntry>,
+    pub trace_eval:
+        &'a TreeVec<Vec<&'a CircleEvaluation<SimdBackend, BaseField, BitReversedOrder>>>,
+    pub column_index_per_interaction: Vec<usize>,
+    pub vec_row: usize,
+    pub domain_log_size: u32,
+    pub n_rows: usize,
+}
+impl<'a> RelationTrackerEvaluator<'a> {
+    pub fn new(
+        trace_eval: &'a TreeVec<Vec<&CircleEvaluation<SimdBackend, BaseField, BitReversedOrder>>>,
+        vec_row: usize,
+        domain_log_size: u32,
+        n_rows: usize,
+    ) -> Self {
+        Self {
+            entries: vec![],
+            trace_eval,
+            column_index_per_interaction: vec![0; trace_eval.len()],
+            vec_row,
+            domain_log_size,
+            n_rows,
+        }
+    }
+
+    pub fn entries(self) -> Vec<RelationTrackerEntry> {
+        self.entries
+    }
+}
+impl<'a> EvalAtRow for RelationTrackerEvaluator<'a> {
+    type F = PackedBaseField;
+    type EF = PackedSecureField;
+
+    // TODO(Ohad): Add debug boundary checks.
+    fn next_interaction_mask<const N: usize>(
+        &mut self,
+        interaction: usize,
+        offsets: [isize; N],
+    ) -> [Self::F; N] {
+        assert_ne!(interaction, INTERACTION_TRACE_IDX);
+        let col_index = self.column_index_per_interaction[interaction];
+        self.column_index_per_interaction[interaction] += 1;
+        offsets.map(|off| {
+            // If the offset is 0, we can just return the value directly from this row.
+            if off == 0 {
+                unsafe {
+                    let col = &self
+                        .trace_eval
+                        .get_unchecked(interaction)
+                        .get_unchecked(col_index)
+                        .values;
+                    return *col.data.get_unchecked(self.vec_row);
+                };
+            }
+            // Otherwise, we need to look up the value at the offset.
+            // Since the domain is bit-reversed circle domain ordered, we need to look up the value
+            // at the bit-reversed natural order index at an offset.
+            PackedBaseField::from_array(std::array::from_fn(|i| {
+                let row_index = offset_bit_reversed_circle_domain_index(
+                    (self.vec_row << (LOG_N_LANES + LOG_N_VERY_PACKED_ELEMS)) + i,
+                    self.domain_log_size,
+                    self.domain_log_size,
+                    off,
+                );
+                self.trace_eval[interaction][col_index].at(row_index)
+            }))
+        })
+    }
+    fn add_constraint<G>(&mut self, _constraint: G) {}
+
+    fn combine_ef(_values: [Self::F; SECURE_EXTENSION_DEGREE]) -> Self::EF {
+        PackedSecureField::zero()
+    }
+
+    fn write_logup_frac(&mut self, _fraction: Fraction<Self::EF, Self::EF>) {}
+
+    fn finalize_logup(&mut self) {}
+
+    fn add_to_relation<R: Relation<Self::F, Self::EF>>(
+        &mut self,
+        entries: &[RelationEntry<'_, Self::F, Self::EF, R>],
+    ) {
+        for entry in entries {
+            let relation = entry.relation.get_name().to_owned();
+            let values = entry.values.iter().map(|v| v.to_array()).collect_vec();
+            let mult = entry.multiplicity.to_array();
+
+            // Unpack SIMD.
+            for j in 0..N_LANES {
+                // Skip padded values.
+                let cannonical_index = bit_reverse_index(
+                    coset_index_to_circle_domain_index(
+                        (self.vec_row << LOG_N_LANES) + j,
+                        self.domain_log_size,
+                    ),
+                    self.domain_log_size,
+                );
+                if cannonical_index >= self.n_rows {
+                    continue;
+                }
+                let values = values.iter().map(|v| v[j]).collect_vec();
+                let mult = mult[j].to_m31_array()[0];
+                self.entries.push(RelationTrackerEntry {
+                    relation: relation.clone(),
+                    mult,
+                    values,
+                });
+            }
+        }
+    }
+}
diff --git a/crates/prover/src/core/pcs/utils.rs b/crates/prover/src/core/pcs/utils.rs
index 36ef3a198..73c624f81 100644
--- a/crates/prover/src/core/pcs/utils.rs
+++ b/crates/prover/src/core/pcs/utils.rs
@@ -41,6 +41,13 @@ impl<'a, T> From<&'a TreeVec<T>> for TreeVec<&'a T> {
     }
 }
 
+/// Converts `&TreeVec<&Vec<T>>` to `TreeVec<Vec<&T>>`.
+impl<'a, T> From<&'a TreeVec<&'a Vec<T>>> for TreeVec<Vec<&'a T>> {
+    fn from(val: &'a TreeVec<&'a Vec<T>>) -> Self {
+        TreeVec(val.iter().map(|vec| vec.iter().collect()).collect())
+    }
+}
+
 impl<T> Deref for TreeVec<T> {
     type Target = Vec<T>;
     fn deref(&self) -> &Self::Target {